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[1]LI Jun-hui,LI Yang-yang.Effects of Site and Tree Age on Leaf Morpho-physiological Traits of Black Locust[J].Research of Soil and Water Conservation,2012,19(04):176-181.

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Effects of Site and Tree Age on Leaf Morpho-physiological Traits of Black Locust

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 04 Page number: 176-181 Column: Public date: 2012-08-20

Title:: Effects of Site and Tree Age on Leaf Morpho-physiological Traits of Black Locust

Author(s):: LI Jun-hui^1,3, LI Yang-yang^1,2; 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
2. Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: site; tree age; Robinia pseudoacacia; leaf morph-physiological traits

CLC:: Q945.79

DOI:: -

Abstract:: Site and tree age are the major factors resulting in the development of small dwarf tree on the Loess Plateau. Thus, this paper studied changes of leaf morpho-physiological traits of black lotcust (Robinia pseudoacacia) with dynamic of tree age under two sites (gully tableland with sufficient water supply and inter-gully slopeland with limited water supply) in order to examine the physiological mechanism of formation of small dwarf tree. The results indicated that black locust growing on the slopeland had smaller leaf area, higher specific leaf mass and leaf thickness, lower whole-tree hydraulic conductance, decreased net photosynthetic rate and stomatal conductance,increased water use efficiency and N, P nutrient content. Changes of leaf morpho-physiological traits of black lotcust with tree age showed the same trend as in drought habitat. Worse leaf water status and decreased proportion of N in photosynthetic organ contributed to the decrease of photosynthetic rate in old-aged trees. Site and tree age showed significant interaction for most leaf traits, indicating decreased photosynthetic area, raised leaf construction cost and lower net photosynthetic rate were major reasons responsible for forming small dwarf tree on the Loess Plateau.

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